Hmm...good size, very great render, as well as a great focus on the render! I like the background image, it really brings the viewer's eyes to the focus--which is Ironman, obviously. Many artists would call that a great "sense of line" when showing such a good focus in art.

I definitely love the color choices, though his head looks a little smashed in, as if you crushed the image in there. Then again, that could be intentional, or I could just be going crazy.

Additionally, your text, mostly on the right side, is a bit hard to read. If you have text, you may want to add an affect or a font color that makes it stand out more and easier to read.

Overall, I'd say great work. MANY artists have a hard time getting that direction or focus in their art, and you're a natural at it. Thanks for sharing!